Elmo Rietschle L-BV7 - Manual (Page 37)

© Gardner Denver Deutschland GmbH 37 / 64 610.48060.40.000
Servicing
Contamination/Problem Remedy
Dirt collects in the motor
cooling fins.  Clean the motor cooling fins at regular intervals.
Fine-grain dirt (e.g. sand) get
into the vacuum
pump/compressor with the
operating liquid or pumped
gases/vapors. Install a liquid separator, filter or screen in the feed pipe.
OR
Regularly dismantle and clean the vacuum pump/compressor housing as
follows:
 Shut unit down.
 Drain the pump-motor unit as described in Chapter 10.1, "Draining",
Pg. 34.
 Unscrew the housing with a 36 mm [ 3 /
8
"] wrench (in direction of arrow
shown on housing) (see Fig. 15, Pg. 38).
 Remove the housing.
 Dirt has collected in the housing. Rinse out the housing.
 Screw on the housing again (opposite direction of arrow shown on
housing) and tighten with a tightening torque of 50 Nm [36.9 ft lbs].
 When commissioning the pump-motor unit, proceed as described in
Chapter 8, "Commissioning", Pg. 28.
Impeller is jammed.  Shut unit down.
 Guide a M6 or M8 bolt (depending on the type) with a sufficient shank
length through the center opening into the fan guard and screw into the
shaft end on the external fan side (see Fig. 16, Pg. 38).
 Free the shaft using the bolt.
 Remove the bolt again.
Extremely hard water used
as operating liquid
Lime content > 15°dH). Soften operating liquid.
OR
Decalcify the pump-motor unit at intervals of 3 months as follows (also see
Fig. 16, Pg. 38):
 Wear personal protective equipment (protective gloves and safety
goggles),
 Shut unit down.
 Drain the pump-motor unit as described in Chapter 10.1, "Draining",
Pg. 34.
 Remove pipes/hoses.
 Fill the unit with decalcifying liquid through one of the connection
openings. Use 10% solution of acetic acid or another commercially
available decalcifying agent.
 Allow the decalcifying liquid to soak for at least 30 minutes.
 Turn the shaft occasionally during this time. To do this, guide a M6 or M8
bolt (depending on the type) with a sufficient shank length through the
center opening into the fan guard and screw into the shaft end on the
external fan side (see Fig. 16, Pg. 38).
 Turn the shaft using the bolt.
 Remove the bolt again.
 Drain the decalcifying liquid out of the unit. To do this, proceed as
described in Chapter 10.1, "Draining", Pg. 34.
 Mount pipes/hoses.
 When commissioning the pump-motor unit, proceed as described in
Chapter 8, "Commissioning", Pg. 28.
 The decalcifying liquid can be disposed of in the sewer system.